DE6901110U - ELECTROMECHANICAL ULTRASONIC ENERGY GENERATOR, IN PARTICULAR FOR WELDING PLASTIC STRAPS. - Google Patents

ELECTROMECHANICAL ULTRASONIC ENERGY GENERATOR, IN PARTICULAR FOR WELDING PLASTIC STRAPS.

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Publication number
DE6901110U
DE6901110U DE6901110U DE6901110U DE6901110U DE 6901110 U DE6901110 U DE 6901110U DE 6901110 U DE6901110 U DE 6901110U DE 6901110 U DE6901110 U DE 6901110U DE 6901110 U DE6901110 U DE 6901110U
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DE
Germany
Prior art keywords
ultrasonic energy
energy generator
generator according
sonotrode
transducer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
DE6901110U
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German (de)
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ERAPA AG
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ERAPA AG
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Publication of DE6901110U publication Critical patent/DE6901110U/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/834—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools moving with the parts to be joined
    • B29C66/8341—Roller, cylinder or drum types; Band or belt types; Ball types
    • B29C66/83411—Roller, cylinder or drum types
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
    • B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
    • B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
    • B06B1/02—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
    • B06B1/06—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction
    • B06B1/0607—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction using multiple elements
    • B06B1/0611—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction using multiple elements in a pile
    • B06B1/0618—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction using multiple elements in a pile of piezo- and non-piezoelectric elements, e.g. 'Tonpilz'
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
    • B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
    • B06B3/00—Methods or apparatus specially adapted for transmitting mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/08—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/812—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • B29C66/8126—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps characterised by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • B29C66/81264—Mechanical properties, e.g. hardness
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81431—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined comprising a single cavity, e.g. a groove
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/834—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools moving with the parts to be joined
    • B29C66/8341—Roller, cylinder or drum types; Band or belt types; Ball types
    • B29C66/83411—Roller, cylinder or drum types
    • B29C66/83417—Roller, cylinder or drum types said rollers, cylinders or drums being hollow
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/95—Measuring or controlling the joining process by measuring or controlling specific variables not covered by groups B29C66/91 - B29C66/94
    • B29C66/951—Measuring or controlling the joining process by measuring or controlling specific variables not covered by groups B29C66/91 - B29C66/94 by measuring or controlling the vibration frequency and/or the vibration amplitude of vibrating joining tools, e.g. of ultrasonic welding tools
    • B29C66/9513—Measuring or controlling the joining process by measuring or controlling specific variables not covered by groups B29C66/91 - B29C66/94 by measuring or controlling the vibration frequency and/or the vibration amplitude of vibrating joining tools, e.g. of ultrasonic welding tools characterised by specific vibration frequency values or ranges
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/95—Measuring or controlling the joining process by measuring or controlling specific variables not covered by groups B29C66/91 - B29C66/94
    • B29C66/951—Measuring or controlling the joining process by measuring or controlling specific variables not covered by groups B29C66/91 - B29C66/94 by measuring or controlling the vibration frequency and/or the vibration amplitude of vibrating joining tools, e.g. of ultrasonic welding tools
    • B29C66/9517—Measuring or controlling the joining process by measuring or controlling specific variables not covered by groups B29C66/91 - B29C66/94 by measuring or controlling the vibration frequency and/or the vibration amplitude of vibrating joining tools, e.g. of ultrasonic welding tools characterised by specific vibration amplitude values or ranges
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0037—Other properties
    • B29K2995/0086—Fatigue strength

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)
  • Pressure Welding/Diffusion-Bonding (AREA)

Description

PatentanwältePatent attorneys

Dipl. Ing. J. F. WochingBt
Dipl. Ing. Jürgen Rost
8 München 13, Tmigstr. 39, Tel. 371946 Dipl. Ing. JF WochingBt
Dipl. Ing. Jürgen Rost
8 Munich 13, Tmigstr. 39, Tel. 371946

baser Zeichen; E 169baser characters; E 169

EHAPA A.-G., Zumikon / SchweizEHAPA A.-G., Zumikon / Switzerland

Elektromechanischer Ultraschallenergieerzeuger, insbesondere zum Verschweissen von KunststoffbändernElectromechanical ultrasonic energy generator, in particular for welding plastic straps

Die Erfindung betrifft einen elektromechanischen Ultraschallenergieerzeuger, insbesonders zum Verschweissen von Kunststoffoändern, wie sie beispielsweise für die Umreifung von Packgütern anstelle von Stahlbändern Verwendung finden.The invention relates to an electromechanical ultrasonic energy generator, especially for welding plastic bands, such as those used for strapping of packaged goods instead of steel straps.

Die Hauptschwierigkeit beim Verschweissen von Kunststoffbändern, welche im zusammengesetzten Zustand auf Zug beansprucht werden, besteht darin, eine im Vergleich zurThe main difficulty when welding plastic strips, which are subject to tension when assembled is to be compared to a

-2--2-

Banddicke dünne Schinelzzone an den Berührungsflächen der sich überlappenden Bandenden zu erzielen, damit die Struktur des Bandmaterials und damit seine Zugfestigkeit weitgehend erhalten bleibt. Zu diesem Zwecke muss die der Schweißstelle zuzuführende Energie bei tunlichst kurzzeitiger und auf dieStrip-thick, thin Schinelzzone on the contact surfaces of the to achieve overlapping tape ends, so that the structure of the tape material and thus its tensile strength to a large extent preserved. For this purpose, the energy to be supplied to the welding point must be as short as possible and on the

Berührungsflächen konzentrierter Einwirkung verhältnismäßig • hoch sein. Bei Anwendung des zur Lösung dieses ProblemsContact areas of concentrated action should be • relatively high. When using the to solve this problem

j an sich besonders gut geeigneten Ultraschallschweissver-j particularly well suited ultrasonic welding

fahrens ist deshalb ein Ultraschallerzeuger mit hoherdriving is therefore an ultrasonic generator with a high

Leistung erforderlich.Performance required.

: JDie für den genannten und ähnliche Anwendungsfälle verfüg- : JThe available for the named and similar applications

'; baren Ultraschallenergieerzeuger sind mit magnetostriktiven'; ultrasonic energy generators are with magnetostrictive

Wandlern ausgerüstet, da mit den sonst in verschiecöier Hin-Converters, since with the otherwise in different directions

't sieht vorteilhafteren piezoelektrischen Wandlern bisher keine 't looks favorable piezoelectric transducers not have

genügende Leistungsausbeuto erzielt werden konnte. Zur Übertragung der Ultraschallenergie vom Wandler auf das Werkstück und gleichzeitiger Erhöhung der Schwingungsamplitude dient eine an den Wandler angeschlossene Sonotrode mit nach vorn stetig abnehmendem Querschnitt. Als Material für die Sonotrode erschien bisher Titan am besten ojeignet, während gewisse, in bezug auf die dchallimpedanzanpassung zwischen Wandler und Werkstück in gewissen Fällen günstigere undsufficient power output could be achieved. A sonotrode connected to the transducer with a continuously decreasing cross-section serves to transmit the ultrasonic energy from the transducer to the workpiece and, at the same time, to increase the oscillation amplitude. As the material for the sonotrode titanium appeared so far best o jeignet while certain favorable with respect to the dchallimpedanzanpassung between the transducer and the workpiece in some cases, and

6801110!6801110!

ausserdern billigere Leichtmetalle nicht den gewünschten Rrfolj brachten.besides cheaper light metals not the desired ones Rrfolj brought.

Diese bekannten Ultraschallenergieerzeuger sinci jedoch verhältnismässig teuer, sowohl in der Anschaffung als auch im Betrieb, und ausserdem ziemlich schwer. Zum Betrieb solcher Geräte ist eine umfangreiche und ebenfalls kostspielige Generatorenanlage erforderlich. Ein weiterer Nachteil besteht darin, daß die Sonotrode nicht ohne weiteres austauschbar ist, sondern aus schwingungstechnischen Gründen bei jedem Ersatz durch Nacharbeiten an den Wandler angeppßt werden muß.However, these known ultrasonic energy generators are relatively expensive, both to buy and to purchase in operation, and also quite difficult. To operate such Equipment, an extensive and also expensive generator system is required. There is another disadvantage in that the sonotrode is not easily exchangeable, but for reasons of vibration technology must be pinned to the converter for each replacement by reworking.

Beim Ultraschallenergieerzeuger nach der Erfindung sind diese Nachteile weitgehend vermieden. Versuche mit piezoelektrischen Wandlern haben nämlich ergeben, daß bei geeigneter Ausbildung der Sonotrode eine viel höhere Schallenergiedichte erreichbar ist, als nach dem Stand der Technik zu erwarten war.With the ultrasonic energy generator according to the invention, these disadvantages are largely avoided. Experiments with piezoelectric Converters have shown that with a suitable design of the sonotrode a much higher sound energy density is achievable than was to be expected from the state of the art.

Erfindmgsgetnäß ist der Ultraschallenergieerzeuger mit einem piezoelektrischen Wandler ausgerüstet, an den sich eine Sonotrode aus Leichtmetall anschließt, deren KopfendflächeAccording to the invention, the ultrasonic energy generator is provided with a equipped with a piezoelectric transducer, to which a sonotrode made of light metal is connected, its head end surface

größer ist als der geringste Querschnitt derselben und welche einen achsialen Hohlraum, der sich vom wandlerseitigen Fuß derselben bis nahe an die Kopfendfläcne erstreckt, und an der zwischen dem als akustischer Transformator ausgebildeten Teil derselben und dem Kopf liegenden Stelle des geringsten Querscnnitts eine Dehnstrecke mit über inre Länge gleichbleibendem Querschnitt aufweist.is larger than the smallest cross section of the same and which has an axial cavity extending from the transducer-side The foot of the same extends close to the head end surface, and at the point of the located between the part designed as an acoustic transformer and the head smallest cross-section has an expansion path with a cross-section that is constant over its length.

Im Gegensatz zu Sonotroden mit vom wandlerseitigen Fuß bis zum Kopf abnehmendem Querschnitt läßt sich durch die Anordnung einer Engestelle zwischen dem Kopf und dem als akustischer Transformator ausgebildeten Fußteil bei gleichbleibender Kopffläche und gleichem Grad der Amplitudenerhc'nung (Querschnittsverminderung) eine erheblich kleinere Fußendfläche erreichen. Dies hat den Vorteil, daß der Fuß der Sonotrode im Querschnitt dem bezüglich der umzusetzenden Leistung verhältnismäßig kleinen piezoelektrischen Wandler besser angepaßt werden kann. Umgekehrt läßt sich auf diese Weise bei gegebener Wandlergröße eine größere Schweißfläche erzielen. Allerdings darf das Verhältnis der äußeren Abmessungen von Kopf und Engestelle aus schwingungstechnischen Gründen nicht zu groß werden. Um diesem Umstand Rechnung zu tragen, ist deshalb die Sonotrode nicht massiv ausgeführt.In contrast to sonotrodes with from the transducer foot to The cross-section decreasing towards the head can be identified by the arrangement of a constriction between the head and the as acoustic Transformer-trained foot part with the same head area and the same degree of amplitude increase (Reduction in cross-section) achieve a considerably smaller foot end area. This has the advantage that the foot of the sonotrode in cross-section the relatively small piezoelectric transducer in terms of the power to be converted can be better customized. Conversely, a larger welding surface can be achieved in this way for a given transducer size achieve. However, the relationship between the external dimensions of the head and the narrow frame may be due to vibrational factors Reasons don't get too big. In order to take this into account, the sonotrode is therefore not made massive.

χ 5 -.χ 5 -.

t s.«t s. "

sondern, mit einem Hohlraum versehen, wodurch die Engestelle bei gleichbleibendem Querschnitt eine größere Außenabmessung aufweisen kann.rather, provided with a cavity, eliminating the constrictions can have a larger external dimension with the same cross-section.

Die an der Engestelle vorgesehene Dehnstrecke hat sich als notwendig erwiesen, um die sonst vorhandene Bruchgefa.hr zu eliminieren.The expansion section provided at the narrow point has proven to be necessary in order to reduce the otherwise existing risk of fracture eliminate.

Nachstehend wird anhand der Zeichnung ein Ausführungsbeispiel der Erfindung näher erläutert.An exemplary embodiment of the invention is explained in more detail below with reference to the drawing.

Der im Längsschnitt dargestellte elektromechanische Ultraschallenergieerzeuger enthält einen piezoelektrischen Wandler, der aus zwei übereinander liegenden scheibenförmigen Elementen 1 und 2 aufgebaut ist, welche beispielsweise aus Bleizirkonattitanat bestehen und eine zentrale Bohrung aufwiesen. Zwischen den beiden Wandlerelementen 1 und 2 liegt eine elektrisch leitende Kontaktscheibe 3, z.B. aus verkupfertem Stahlblech oder eine Cu-Be-Legierung, in deren Zentrum ein koachsial angeordneter Anschlußleiter in Form eines Kupferrohres 4 mit Isolation 5 angenietet ist.The electromechanical ultrasonic energy generator shown in longitudinal section contains a piezoelectric transducer, which consists of two superimposed disc-shaped Elements 1 and 2 is constructed, which for example consist of lead zirconate titanate and had a central bore. Between the two transducer elements 1 and 2 there is an electrically conductive contact disc 3, e.g. made of copper-plated Sheet steel or a Cu-Be alloy, in the center of which a coaxially arranged connecting conductor in the form a copper pipe 4 with insulation 5 is riveted.

f An den piezoelektrischen Wandler schließt sich eine Sono-f The piezoelectric transducer is connected to a sonic

6301110 t in 6301110 t in

*rode 6 aus Leichtmetall, vorzugsweise aus einer Al-Si-Mg-Legierung an, die mit ihrem ?uß 7 in eine den Wandler umgebende, mit Innengewinde versehene Spannhülse 8 eingeschraubt ist. Auf der gegenüberliegenden Seite des Wandlers befindet sich ein Gegenhalter 9, der so fest in die Spannhülse 8 eingeschraubt ist, daß auf den zwischen Sonotrode 6 und Gegenhalter 9 eingespannten Wandler ein Achsialdruck. von etwa 250 bis 300 kg/cm ausgeübt wird. Die Spannhülse 8 und der Gegenhalter 9 bestehen vorzugsweise aus dem gleichen Material wie die Sonotrode 6. An den Übergangsstellen vom Wandlerelement 1 zum Fuß 7 der Sonotrode 6 und vom Wandlerelement 2 zum Gegenhalter 9 sind Zwischenlagen 10 bzw. 11 aus verkupfertem Stahlblech oder einer Cu-Be-Legierung eingefügt. An ihrem Umfang sind die Wandlerelemente 1 und 2 durch einen nachgiebigen Isolierring 12, beispielsweise aus Silikongummi, von der Spannhülse 8 getrennt. Zur Befestigung des Ultraschallenergieerzeugers dient ein Außenflansch 13 an der Spannhülse 8, der in der Mittelebene des piezoelektrischen Wandlers liegt. Die Stromzuführung zum Wandler erfo einerseits über den Anschlußleiter 4 und andererseits über den Außenflansch 13 der Spannhülse 8.Rod 6 made of light metal, preferably made of an Al-Si-Mg alloy, which is screwed with its outside 7 into a clamping sleeve 8 which surrounds the transducer and is provided with an internal thread. On the opposite side of the transducer there is a counter holder 9 which is screwed so tightly into the clamping sleeve 8 that an axial pressure is exerted on the transducer clamped between the sonotrode 6 and the counter holder 9. from about 250 to 300 kg / cm. The clamping sleeve 8 and the counter holder 9 are preferably made of the same material as the sonotrode 6. At the transition points from the transducer element 1 to the foot 7 of the sonotrode 6 and from the transducer element 2 to the counter holder 9, intermediate layers 10 and 11 made of copper-plated sheet steel or a copper Be alloy inserted. At their circumference, the transducer elements 1 and 2 are separated from the clamping sleeve 8 by a flexible insulating ring 12, for example made of silicone rubber. An outer flange 13 on the clamping sleeve 8, which lies in the center plane of the piezoelectric transducer, is used to fasten the ultrasonic energy generator. The power supply to the converter is carried out on the one hand via the connecting conductor 4 and on the other hand via the outer flange 13 of the clamping sleeve 8.

Die Sonotrode 6 weist einen Hohlraum, im vorliegenden Beispiel eine zylindrische Bohrung 14 auf, welche bich vom The sonotrode 6 has a cavity, in the present example a cylindrical bore 14, which bich from

wandlerseitigen Fuß 7 der Sonotrode 6 bis in den Kopftransducer-side foot 7 of the sonotrode 6 up to the head

uerselben und nahe an die Kopfendfläche 16 erstreckt, unduers same and extends close to the head end surface 16, and

zwar soll der .abstand vom kopfseitigen Ende der BohrungThe distance from the head end of the hole should be

zur Kopfendfläche 16 etwa die Hälfte des Bohrungsdurchmessers betragen.to the head end face 16 be about half the bore diameter.

An der Stelle des geringsten Querschnitts, d.h. zwischen dem als akustischer Transformator ausgebildeten Teil 17 der Sonotrode 6, mit vom Fuß 7 her stetig abnehmendem Querschnitt, und dem Kopf 15 derselben ist eine Dehnstrecke 18 mit über ihre Länge a gleichbleibendem Querschnitt vorgesehen. Dank dieser Maßnahme kann die Kopfendfläche 16 des sich nach vorne erweiternden Kopfes 15 bis etwa zehnmal so groß sein wie der geringste Querschnitt an der Dehnstrecke 18. Die Kopfendflä-'he 16 kann bei sonst rotationssymmetrisch ausgebildeter Sonotrode 6 rechteckförmig sein.At the point of the smallest cross-section, i.e. between the part 17 designed as an acoustic transformer the sonotrode 6, with its cross section steadily decreasing from the foot 7, and the head 15 of the same is an expansion path 18 is provided with a constant cross section over its length a. Thanks to this measure, the head end face 16 of the head, which widens towards the front, can be up to about ten times as large as the smallest cross-section the expansion distance 18. The head end surface 16 can otherwise rotationally symmetrical sonotrode 6 be rectangular.

Praktisch bewährt hat sich folgende, zum Verschweißen von Kunststoffbändern bestimmte Ausführungsform des beschriebenen UltraüChallenergieerzeugers. Die Wandlerelemente sind gelochte Scheiben aus Bleizirkon;. ttitanat mit einem Außendurchmesser von 38 mm, einem Innendurchmesser von 17 mmThe following embodiment of the one described, which is intended for welding plastic strips, has proven itself in practice Ultraechall energy generator. The transducer elements are perforated lead zirconia disks ;. titanate with an outside diameter of 38 mm, an inner diameter of 17 mm

— O "~- O "~

und einer Dicke von je b,35 t-vd. Die oonotrode besteht aus "Anticorodal B" und besitzt tei einer Resonanzfrequenz des ganzen Schwingsystem^ von etwa 1b kHz eine Gesamtlänge von etwa 70 mra. Der größte Außendurchmesser derselben beträgt 4 5 mra, der kleinste etwa 19 mm. Die Dehnstrecke hat eine Länge von 10 - 15 mm und die Bohrung einen Durchmesser vonand a thickness of b, 35 t-vd each. The oonotrode consists of "Anticorodal B" and has a resonance frequency of the whole oscillating system ^ of about 1b kHz and a total length of about 70 mra. The largest outside diameter of the same is 4 5 mra, the smallest about 19 mm. The expansion section has a length of 10-15 mm and the bore has a diameter of

mm. Der rechteckig ausgeführte Kopf besitzt eine Endche von etwa 10
beträgt etwa 16 mm.mm. The rectangular head has an end surface of about 10
is about 16 mm.

ρ
fläche von etwa 10 cm . Die achsiale Länge des Gegenhaltersρ
area of about 10 cm. The axial length of the anvil

Mit diesem Ultraschallenergieerzeuger können für die Umreifung von Packgütern bestimmte Kunststoffbänder mit einer Dicke von beispielsweise 1 mm in einer halben Sekunde einwandfrei verschweißt werden, wobei die Zerreißfestigkeit an der Schweißstelle noch etwa 95 0A von derjenigen des ursprünglichen Bandmaterials beträgt. Je nach Bandmaterial und -dicke ist eine Eingangsleistung von durchschnittlich etwa 1JOOO W bei einer Betriebsspannung von etwa 1500 V erforderlich.With this ultrasonic energy generator, certain plastic straps with a thickness of, for example, 1 mm can be flawlessly welded in half a second for strapping packaged goods, the tensile strength at the welding point still being about 95 0 A of that of the original strap material. Depending on the strip material and thickness, an input power of around 1 JOOO W on average is required at an operating voltage of around 1500 V.

PatentansprücheClaims

6801110 » a„6801110 »a"

Claims (1)

ttayaspruchettaya sayings 1. Slektromechanischer Ultraschalleaergieerzeuger, insbesondere zum Verschweißen von Kunststoffbändern, dadurch gekennzeichnet, daß er mit einem piezoelektrischen Wandler ausgerüstet ist, an den sich eine oonotorde aus Leichtmetall anschließt, deren Kopfendfläche größer ist als der geringste Querschnitt derselben und welche einen achsialen Hohlraum, der sich vom wandlerseitigen Fuß derselben bis nahe an die Kopfendfläche erstreckt, und an der zwischen dem als akustischer Transformator ausgebildeten Teil derselben und den Kopf liegenden Stelle des geringsten Querschnitts eine Dehnstaecke mit über ihre Länge gleichbleibenden Querschnitt aufweist.1. Slectromechanical ultrasonic energy generator, in particular for welding plastic strips, characterized in that it is equipped with a piezoelectric transducer is equipped to which an oonotorde made of light metal adjoins, the head end surface of which is larger than the smallest cross section of the same and which has an axial cavity, which extends from the transducer-side foot of the same to close to the head end surface, and on the one between the as acoustic Transformer formed part of the same and the head lying point of the smallest cross-section an expansion part with a constant cross-section over its length. 2. Ultraschallenergieerzeuger nach Anspruch 1, dadurch gekennzeichnet, daß der piezoelektrische Wandler aus zwei übereinander liegenden scheibenförmigen Elementen mit zentraler Bohrung aufgebaut ist, zwischen denen eiue elektrisch leitende Kontaktscheibe liegt, in deren Zentrum ein koachsial an- E geordneter Anschlußleiter befestigt ist.2. Ultrasonic energy generator according to claim 1, characterized in that that the piezoelectric transducer consists of two superposed disc-shaped elements with a central Bore is built, between which eiue electrically conductive Contact disk is located, in the center of which a coaxially arranged connecting conductor is attached. - 10 -- 10 - 6801110 a 3.716801110 a 3.71 3. Uitraschallonergieerzeuger nach einem eier Ansprüche3. Ultrasonic energy generator according to one of the claims 1 "bis 2, dadurch gekennzeichnet> daß für den piezoelektrischen Wandler Elemente aus Bleizirkcnattitanat verwendet sind.1 "to 2, characterized by> that elements made of lead zirconate titanate are used for the piezoelectric transducer. 4. Ultraschallenergieerzeuger nach einem der Ansprüche4. Ultrasonic energy generator according to one of the claims 1 bis Ji, dadurch gekennzeichnet, daß der piezoelektrische1 to Ji, characterized in that the piezoelectric ;; Wandler zwischen dem Fuß der Sonotrode und einem Gegenhalter,;; Transducer between the foot of the sonotrode and a counter holder, welche durch eine den Wandler umgebende Spannhülse miteinanderwhich are connected to one another by a clamping sleeve surrounding the transducer j verbunden sind, eingespannt ist.j are connected, is clamped. 5. Ultraschallenergieerzeuger nach Anspruch 4, dadurch gekennzeichnet, daß die Spannhülse mit Innengewinde versehen ist und daß die Sonotrode mit ihrem Fuß auf der einen Seite und der Gegenhalter auf der anderen Seite des Wandlers in die Spannhülse eingeschraubt ist.5. Ultrasonic energy generator according to claim 4, characterized in that that the clamping sleeve is provided with an internal thread and that the sonotrode with its foot on one side and the counter holder on the other side of the converter in the Adapter sleeve is screwed in. 6. Ultraschallenergieerzeuger nach einem der Ansprüche6. Ultrasonic energy generator according to one of the claims 3 bis 5, dadurch gekennzeichnet, daß der Wandler mit einem Achsialdruck von etwa 250 bis 300 kg/cm vorgespannt ist.3 to 5, characterized in that the transducer is preloaded with an axial pressure of about 250 to 300 kg / cm. 7. Ultraschallenergieerzeuger nach Anspruch 4, dadurch ger7. Ultrasonic energy generator according to claim 4, characterized ger : kennzeichnet j daß zu seiner Befestigung die Spannhülse einen: denotes j that the clamping sleeve is a Außenflansch aufweist.Has outer flange. - 11 -- 11 - ο. Ultraschallenergieerzeuger nach Anspruch 7, dadurch gekennzeichnet, daß der Außenflansch in der Mittelebene aes piezoelektrischen Wandlers liegt.ο. Ultrasonic energy generator according to Claim 7, characterized in that that the outer flange lies in the center plane of the piezoelectric transducer. 9. UltBschallenergieerzöuger nach Anspruch 4, dadurch gekennzeichnet, daß die Spannhülse und der Gegenhalter aus dem gleichen Material wie die sonotrode bestehen.9. UltBschallenergieerzöuger according to claim 4, characterized in that that the clamping sleeve and the counter holder are made of the same material as the sonotrode. 10. Ultraschallenergieerzeuger nach Anspruch 4, dadurch gekennzeichnet, daß der piezoelektrische Wandler an seinem Umfang durch einen nachgiebigen Isolierring von der Spannhülse getrennt ist.10. Ultrasonic energy generator according to claim 4, characterized in that that the piezoelectric transducer is attached to its circumference by a flexible insulating ring from the clamping sleeve is separated. 11. Ultraschallenergieerzeuger nach Anspruch 10, dadurch gekennzeichnet, daß der Isolierring aus Silikongumci besteht.11. Ultrasonic energy generator according to claim 10, characterized in that that the insulating ring is made of silicone gumci. 12. Ultraschallenergieerzeuger nach Anspruch 4, dadurcn gekennzeichnet, daß an den Übergangsstellen vom piezoelektrischen Wandler zum Fuß der Sonotrode und zum Gegenhalter Zwischenlagen aus verkupfertem Stahlblech oder einer Cu-Be-Legierung eingefügt sind.12. Ultrasonic energy generator according to claim 4, characterized in that that at the transition points from the piezoelectric transducer to the foot of the sonotrode and to the counter holder intermediate layers made of copper-plated sheet steel or a Cu-Be alloy are inserted. 15. Uitraschallene-rgieerzeuger nach einem der Ansprüche 1 bis 12, dauurch gekennzeichnet, daß die Sonotrode aus einer Al-Legierung besteht.15. Ultrasonic energy generator according to one of the claims 1 to 12, characterized in that the sonotrode consists of an Al alloy. - 12 -- 12 - 14. Ultraschallenergieerzeuger nach Anspruch 15, aadurca gekennzeichnet, daß die Sonotrode aus einer Ai-3i-Mg-Legierung besteht.14. Ultrasonic energy generator according to claim 15, aadurca characterized in that the sonotrode is made of an Al-3i-Mg alloy consists. 15. Ultraschallenergieerzeuger nach einem der Ansprüche15. Ultrasonic energy generator according to one of the claims 1 bis 14, dadurch gekennzeichnet, daß die Kopfendfli\che der oonotroue bis etwa zehnmal so groß ist wie der geringste querschnitt derselben.1 to 14, characterized in that the head end face of the oonotroue to about ten times the size of the smallest cross section of the same. 16. Ultraschallenergieerzeuger· nach einem der Ansprüche16. Ultrasonic energy generator · according to one of the claims 1 bis 15, dadurch gekennzeichnet, daß die Kopfendfläche bei sonst rotationssymmetrisch ausgebildeter Sonotrode rechteckförmig ist.1 to 15, characterized in that the head end surface at otherwise rotationally symmetrical sonotrode is rectangular. 17. Ultraschallenergieerzeuger nach einem der Ansprüche17. Ultrasonic energy generator according to one of the claims 1 bis 16, dadurch gekennzeichnet, daß bei kreiszylindrischem Hohlraum der Sonotrode der Abstand vom kopfseitigen Ende desselben zur Kopfendfläche etwa die Hälfte des Hohlraumdurchmessers beträgt.1 to 16, characterized in that with circular cylindrical The cavity of the sonotrode is the distance from the head end of the same to the head end surface is about half the cavity diameter.
DE6901110U 1968-11-12 1969-01-13 ELECTROMECHANICAL ULTRASONIC ENERGY GENERATOR, IN PARTICULAR FOR WELDING PLASTIC STRAPS. Expired DE6901110U (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1715668A CH498662A (en) 1968-11-12 1968-11-12 Electromechanical ultrasonic energy generator, in particular for welding plastic strips

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Publication Number Publication Date
DE6901110U true DE6901110U (en) 1972-03-02

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DE19691901449 Pending DE1901449A1 (en) 1968-11-12 1969-01-13 Electromechanical ultrasonic energy generator, in particular for welding plastic strips
DE6901110U Expired DE6901110U (en) 1968-11-12 1969-01-13 ELECTROMECHANICAL ULTRASONIC ENERGY GENERATOR, IN PARTICULAR FOR WELDING PLASTIC STRAPS.

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DE19691901449 Pending DE1901449A1 (en) 1968-11-12 1969-01-13 Electromechanical ultrasonic energy generator, in particular for welding plastic strips

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JP (1) JPS49998B1 (en)
CH (1) CH498662A (en)
CS (1) CS185555B2 (en)
DE (2) DE1901449A1 (en)
FR (1) FR2024833A1 (en)
GB (1) GB1232128A (en)
NL (1) NL6915980A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29813964U1 (en) 1998-08-04 1998-12-24 Ultrasonics Steckmann GmbH, 61279 Grävenwiesbach Ultrasonic processing device and sonotrode therefor
EP3335807A1 (en) * 2016-12-16 2018-06-20 SONOTRONIC Nagel GmbH Sonotrode and vibrating unit with such a sonotrode

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4203729A1 (en) * 1992-02-06 1993-08-12 Harald Dr Ing Hielscher Mechanical amplitude-amplifier for high amplification of ultrasonic vibrations - has graded conical vibrator shape with reflection surface area larger than cross-section in the middle region
GB2378346A (en) * 2001-08-03 2003-02-05 Rawson Francis F H Forged ultrasonic amplifier, horn, resonator or sonotrode
JP5237010B2 (en) * 2007-09-11 2013-07-17 日本特殊陶業株式会社 Ultrasonic vibrator and manufacturing method thereof
ES2395345B1 (en) * 2011-01-17 2013-12-05 Universidad Del Pais Vasco-Euskal Herriko Unibertsitatea SONOTRODE TO MECHANIZE PARTS AND MACHINING EQUIPMENT THAT INCLUDES SUCH SONOTRODE
EP3017878A4 (en) * 2013-07-03 2017-03-15 Olympus Corporation Ultrasonic vibration device, ultrasonic vibration device manufacturing method, and ultrasonic medical apparatus
US9718144B2 (en) * 2014-06-09 2017-08-01 Branson Ultrasonics Corporation High bandwidth large surface area ultrasonic block horn

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29813964U1 (en) 1998-08-04 1998-12-24 Ultrasonics Steckmann GmbH, 61279 Grävenwiesbach Ultrasonic processing device and sonotrode therefor
EP3335807A1 (en) * 2016-12-16 2018-06-20 SONOTRONIC Nagel GmbH Sonotrode and vibrating unit with such a sonotrode

Also Published As

Publication number Publication date
FR2024833A1 (en) 1970-09-04
CS185555B2 (en) 1978-10-31
NL6915980A (en) 1970-05-14
JPS49998B1 (en) 1974-01-10
CH498662A (en) 1970-11-15
GB1232128A (en) 1971-05-19
DE1901449A1 (en) 1970-07-16

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